Mainly, I find that the bosses just get exponentially easier to fight as you practice more. Lionotus is just going to be another mindless grinding raid soon ;-;
Edit
Well, joining the Macha Lionotus with Heart boat. Only died 3 times (still took 50 minutes, randoms D:)
[Image: http://i53.tinypic.com/so9ysk.jpg]
Party was 5 Evies, 1 Lann, 2 Fionas. I'm still using Swords on my Fiona too.
Edit 2
Managed a 0 Death, 0 Potion run on Lionotus today (Macha too!). Got 3rd in damage with ~16%.
That leaves only Colru who I haven't managed a 0 Death/Potion on.